Transmission fluid changes on the 722.6 probably run anywhere around $250-$350. It takes at least 8 quarts of fluid and that stuff runs around $13-$14 a quart. The MB fluid is the ONLY approved fluid for the transmission in your car.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record